Active control of type-I edge localized modes on JET

Y. Liang, H.R. Koslowski, P.R. Thomas, E. Nardon, S. Jachmich, B. Alper, P. Andrew, Y. Andrew, G. Arnoux, Y. Baranov, M. Bécoulet, M. Beurskens, T. Biewer, M. Bigi, K. Crombe, E. De La Luna, P. De Vries, T. Eich, H.G. Esser, W. FundamenskiS. Gerasimov, C. Giroud, M.P. Gryaznevich, D. Harting, N. Hawkes, S. Hotchin, D. Howell, A. Huber, M. Jakubowski, V. Kiptily, A. Kreter, L. Moreira, V. Parail, S.D. Pinches, E. Rachlew, O. Schmitz, O. Zimmermann

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Abstract

The operational domain for active control of type-I edge localized modes (ELMs) with an n = 1 external magnetic perturbation field induced by the ex-vessel error field correction coils on JET has been developed towards more ITER-relevant regimes with high plasma triangularity, up to 0.45, high normalized beta, up to 3.0, plasma current up to 2.0 MA and q95 varied between 3.0 and 4.8. The results of ELM mitigation in high triangularity plasmas show that the frequency of type-I ELMs increased by a factor of 4 during the application of the n = 1 fields, while the energy loss per ELM, ΔW/W, decreased from 6% to below the noise level of the diamagnetic measurement (<2%). No reduction of confinement quality (H98Y) during the ELM mitigation phase has been observed. The minimum n = 1 perturbation field amplitude above which the ELMs were mitigated increased with a lower q95 but always remained below the n = 1 locked mode threshold. The first results of ELM mitigation with n = 2 magnetic perturbations on JET demonstrate that the frequency of ELMs increased from 10 to 35 Hz and a wide operational window of q95 from 4.5 to 3.1 has been found. © 2007 IOP Publishing Ltd.
Original languageEnglish
Pages (from-to)-
JournalPlasma Physics and Controlled Fusion
Volume49
Issue number12 B
DOIs
Publication statusPublished - 1 Dec 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Nuclear and High Energy Physics

Cite this

Liang, Y., Koslowski, H. R., Thomas, P. R., Nardon, E., Jachmich, S., Alper, B., ... Zimmermann, O. (2007). Active control of type-I edge localized modes on JET. Plasma Physics and Controlled Fusion, 49(12 B), -. https://doi.org/10.1088/0741-3335/49/12B/S54